Watch Fifth Harmony Cover One Direction's "They Don't Know About Us"

In addition to being the biggest girl group in the world right now (Little Mix who?) Fifth Harmony are known for their friendships. Late last year the girls went on tour with teen dream Austin Mahone and fierce diva Demi Lovato. Earlier this month they released an anti-smoking jam with "Shower" internet sensation Becky G. Today it's all about those British boys in One Direction, with the 5H ladies slowing down the 2012 jam "They Don't Know About Us" during a visit toSydney, Australia's KIIS 106.5.

Fifth Harmony's spin on the 1D non-hit channeled the '90s boy bands, with tons of group harmonies and soaring synths.

Fifth Harmony's version is a lot sexier than the original, steeped in their R&B sound. Each girl gets a turn playing a One Direction boy and the result is sensational. Check it out above and make sure to check out our guide to the most grrrl power lyrics on 5H's debut full-length, Reflection.